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authorSongjun Wu <songjun.wu@atmel.com>2016-01-18 13:14:44 +0300
committerVinod Koul <vinod.koul@intel.com>2016-01-18 16:37:46 +0300
commit611dcadb01c89d1d3521450c05a4ded332e5a32d (patch)
tree9109cbbf1c148268fe94ee211d05f455ecf2fb5c /drivers/dma/at_xdmac.c
parent2895b2cad6e7a95104cf396e5330054453382ae1 (diff)
downloadlinux-611dcadb01c89d1d3521450c05a4ded332e5a32d.tar.xz
dmaengine: at_xdmac: fix resume for cyclic transfers
When having cyclic transfers, the channel was paused when performing suspend but was not correctly resumed. Signed-off-by: Songjun Wu <songjun.wu@atmel.com> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver") Cc: <stable@vger.kernel.org> # 4.1 and later Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/at_xdmac.c')
-rw-r--r--drivers/dma/at_xdmac.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index d0ae4613b87e..c21aef74e8d1 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1697,6 +1697,7 @@ static int at_xdmac_device_terminate_all(struct dma_chan *chan)
list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node)
at_xdmac_remove_xfer(atchan, desc);
+ clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
spin_unlock_irqrestore(&atchan->lock, flags);
@@ -1829,6 +1830,8 @@ static int atmel_xdmac_resume(struct device *dev)
atchan = to_at_xdmac_chan(chan);
at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc);
if (at_xdmac_chan_is_cyclic(atchan)) {
+ if (at_xdmac_chan_is_paused(atchan))
+ at_xdmac_device_resume(chan);
at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda);
at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);
at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim);